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< title data-rh = "true" > WebWorker.evaluate() method | Puppeteer< / title > < meta data-rh = "true" name = "viewport" content = "width=device-width,initial-scale=1" > < meta data-rh = "true" name = "twitter:card" content = "summary_large_image" > < meta data-rh = "true" property = "og:url" content = "https://pptr.dev/next/api/puppeteer.webworker.evaluate" > < meta data-rh = "true" property = "og:locale" content = "en" > < meta data-rh = "true" name = "docsearch:language" content = "en" > < meta data-rh = "true" name = "docsearch:counter" content = "3" > < meta data-rh = "true" property = "og:title" content = "WebWorker.evaluate() method | Puppeteer" > < meta data-rh = "true" name = "description" content = "Evaluates a given function in the worker." > < meta data-rh = "true" property = "og:description" content = "Evaluates a given function in the worker." > < link data-rh = "true" rel = "icon" href = "/img/favicon.ico" > < link data-rh = "true" rel = "canonical" href = "https://pptr.dev/next/api/puppeteer.webworker.evaluate" > < link data-rh = "true" rel = "alternate" href = "https://pptr.dev/next/api/puppeteer.webworker.evaluate" hreflang = "en" > < link data-rh = "true" rel = "alternate" href = "https://pptr.dev/next/api/puppeteer.webworker.evaluate" hreflang = "x-default" > < link data-rh = "true" rel = "preconnect" href = "https://DVKY664LG7-dsn.algolia.net" crossorigin = "anonymous" > < link rel = "search" type = "application/opensearchdescription+xml" title = "Puppeteer" href = "/opensearch.xml" >
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< p > Evaluates a given function in the < a href = "/next/api/puppeteer.webworker" > worker< / a > .< / p >
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< h4 class = "anchor anchorWithStickyNavbar_LWe7" id = "signature" > Signature:< a href = "#signature" class = "hash-link" aria-label = "Direct link to Signature:" title = "Direct link to Signature:" > < / a > < / h4 >
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< div class = "language-typescript codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-typescript codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token keyword" style = "color:#00009f" > class< / span > < span class = "token plain" > < / span > < span class = "token class-name" > WebWorker< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token generic-function function" style = "color:#d73a49" > evaluate< / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > < < / span > < span class = "token generic-function generic class-name" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token generic-function generic class-name" > Params < / span > < span class = "token generic-function generic class-name keyword" style = "color:#00009f" > extends< / span > < span class = "token generic-function generic class-name" > < / span > < span class = "token generic-function generic class-name builtin" > unknown< / span > < span class = "token generic-function generic class-name punctuation" style = "color:#393A34" > [< / span > < span class = "token generic-function generic class-name punctuation" style = "color:#393A34" > ]< / span > < span class = "token generic-function generic class-name punctuation" style = "color:#393A34" > ,< / span > < span class = "token generic-function generic class-name" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token generic-function generic class-name" > Func < / span > < span class = "token generic-function generic class-name keyword" style = "color:#00009f" > extends< / span > < span class = "token generic-function generic class-name" > EvaluateFunc< / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > < < / span > < span class = "token generic-function generic class-name" > Params< / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > > < / span > < span class = "token generic-function generic class-name" > < / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > =< / span > < span class = "token generic-function generic class-name" > EvaluateFunc< / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > < < / span > < span class = "token generic-function generic class-name" > Params< / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > > < / span > < span class = "token generic-function generic class-name punctuation" style = "color:#393A34" > ,< / span > < span class = "token generic-function generic class-name" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token generic-function generic class-name" > < / span > < span class = "token generic-function generic class-name operator" style = "color:#393A34" > > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > func< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Func < / span > < span class = "token operator" style = "color:#393A34" > |< / span > < span class = "token plain" > < / span > < span class = "token builtin" > string< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > ...< / span > < span class = "token plain" > args< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Params< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > < / span > < span class = "token builtin" > Promise< / span > < span class = "token operator" style = "color:#393A34" > < < / span > < span class = "token plain" > Awaite
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< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "parameters" > Parameters< a href = "#parameters" class = "hash-link" aria-label = "Direct link to Parameters" title = "Direct link to Parameters" > < / a > < / h2 >
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< table > < thead > < tr > < th > Parameter< / th > < th > Type< / th > < th > Description< / th > < / tr > < / thead > < tbody > < tr > < td > func< / td > < td > Func | string< / td > < td > Function to be evaluated.< / td > < / tr > < tr > < td > args< / td > < td > Params< / td > < td > Arguments to pass into < code > func< / code > .< / td > < / tr > < / tbody > < / table >
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< p > < strong > Returns:< / strong > < / p >
< p > Promise< Awaited< ReturnType< Func> > > < / p >
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< p > The result of < code > func< / code > .< / p >
< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "remarks" > Remarks< a href = "#remarks" class = "hash-link" aria-label = "Direct link to Remarks" title = "Direct link to Remarks" > < / a > < / h2 >
< p > If the given function returns a promise, < a href = "/next/api/puppeteer.webworker.evaluate" > evaluate< / a > will wait for the promise to resolve.< / p >
< p > As a rule of thumb, if the return value of the given function is more complicated than a JSON object (e.g. most classes), then < a href = "/next/api/puppeteer.webworker.evaluate" > evaluate< / a > will _likely_ return some truncated value (or < code > {}< / code > ). This is because we are not returning the actual return value, but a deserialized version as a result of transferring the return value through a protocol to Puppeteer.< / p >
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< p > In general, you should use < a href = "/next/api/puppeteer.webworker.evaluatehandle" > evaluateHandle< / a > if < a href = "/next/api/puppeteer.webworker.evaluate" > evaluate< / a > cannot serialize the return value properly or you need a mutable < a href = "/next/api/puppeteer.jshandle" > handle< / a > to the return object.< / p > < / div > < / article > < nav class = "pagination-nav docusaurus-mt-lg" aria-label = "Docs pages" > < a class = "pagination-nav__link pagination-nav__link--prev" href = "/next/api/puppeteer.webworker.close" > < div class = "pagination-nav__sublabel" > Previous< / div > < div class = "pagination-nav__label" > WebWorker.close< / div > < / a > < a class = "pagination-nav__link pagination-nav__link--next" href = "/next/api/puppeteer.webworker.evaluatehandle" > < div class = "pagination-nav__sublabel" > Next< / div > < div class = "pagination-nav__label" > WebWorker.evaluateHandle< / div > < / a > < / nav > < / div > < / div > < div class = "col col--3" > < div class = "tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop" > < ul class = "table-of-contents table-of-contents__left-border" > < li > < a href = "#parameters" class = "table-of-contents__link toc-highlight" > Parameters< / a > < / li > < li > < a href = "#remarks" class = "table-of-contents__link toc-highlight" > Remarks< / a > < / li > < / ul > < / div > < / div > < / div > < / div > < / main > < / div > < / div > < / div > < footer class = "footer footer--dark" > < div class = "container container-fluid" > < div class = "row footer__links" > < div class = "col footer__col" > < div class = "footer__title" > Community< / div > < ul class = "footer__items clean-list" > < li class = "footer__item" > < a href = "https://stackoverflow.com/questions/tagged/puppeteer" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > Stack Overflow< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li class = "footer__item" > < a href = "https://twitter.com/chromedevtools" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > Twitter< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li class = "footer__item" > < a href = "https://goo.gle/devtools-youtube" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > YouTube< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < / ul > < / div > < / div > < div class = "footer__bottom text--center" > < div class = "footer__copyright" > Copyright © 2024 Google, Inc.< / div > < / div > < / div > < / footer > < / div >
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